The Observer view on the Trump-Zelenskyy clash: a moment of dark reckoning | Observer editorial

With or without the US, Europe must learn to defend itself, and Ukraine, against Russian aggression

The treatment of the Ukrainian president, Volodymyr Zelenskyy, by the US president, Donald Trump, during what appears to have been a staged confrontation in the White House in front of the world's press, marks one of the most profoundly shocking moments in US diplomacy in decades.

In this crass and deeply disturbing performance, the wartime leader of a democratic European country that is fighting against an illegal invasion by Russia, which has seen its citizens killed and cities bombed indiscriminately, was subjected to a vicious, ignorant and mendacious attack that was designed to humiliate.